限制为django admin Inline显示的条目的查询集

Question

在django admin中,使用django 1.2,我正在尝试添加一个InlineModelAdmin,以便在对条目进行更改时对保存应用注释.(对于每个编辑,一个条目应该有一个"ChangeComment").

我不想显示以前的条目,所以我试图强制ChangeCommentInline的formset.queryset为空,通过创建NoCommentsInlineFormset并在我的ChangeCommentInline中分配formset ,但仍然返回现有条目.

https://docs.djangoproject.com/en/1.3/topics/forms/modelforms/#changing-the-queryset

注-在上面的链接,他们使用BaseModelFormset,我使用BaseInlineFormset,我想到可能是问题.如果我用BaseModelFormset替换BaseInlineFormset,我得到一个关于"实例"不存在的错误.

admin.py

class NoCommentsInlineFormset(models.BaseInlineFormset):
    def __init__(self, *args, **kwargs):
        super(NoCommentsInlineFormset, self).__init__(*args, **kwargs)
        self.queryset = ChangeComment.objects.none()


class ChangeCommentInline(admin.StackedInline):
    model = ChangeComment
    extra = 1
    exclude = ("user", )
    formset = NoCommentsInlineFormset

    def save_model(self, request, obj, form, change):
        """auto-assign logined in user to comment"""
        if not change:
            obj.user = request.user
        obj.save()    


class EntryAdmin(admin.ModelAdmin):   
    inlines = (ChangeCommentInline, )

可以限制Inline中显示的ChangeComment条目,还是有更好的方法来处理它？

Answer 1

正如评论中提到的benjaoming,有必要覆盖中的get_queryset()方法InlineModelAdmin.InlineModelAdmin正如我最初想的那样,没有必要覆盖和附加新的formset到定义.

以下是最终的实现:

class ChangeCommentInline(admin.StackedInline):
    """For allowing logged in user to add change comment"""
    model = ChangeComment
    extra = 1
    exclude = ("user", ) # auto-update user field in save_formset method of parent modeladmin.


    def get_queryset(self, request):
        """Alter the queryset to return no existing entries"""
        # get the existing query set, then empty it.
        qs = super(ChangeCommentInline, self).get_queryset(request)
        return qs.none()